Fc 51 Ir Sensor Datasheet -

The FC-51 is a low-cost, highly efficient infrared (IR) obstacle avoidance sensor widely used in robotics, automation, and DIY electronics. It features an onboard IR transmitter and receiver pair that detects objects within a specific range.

When an object enters the detection range, the IR light reflects back.

If the light hits a light-colored or reflective object, a significant portion reflects backward. If it hits a matte black or dark object, the material absorbs the IR light, drastically reducing the effective detection range. Fc 51 Ir Sensor Datasheet

The it will operate in ( indoors, outdoors, high ambient light ) What load you want to trigger ( relay, buzzer, motor )

The FC-51 is a low-cost, highly efficient infrared (IR) obstacle avoidance sensor widely used in robotics, automation, and smart home projects. This module utilizes a pair of infrared transmitting and receiving tubes to detect obstacles within a specific range. When an object enters the detection field, the infrared light reflects back to the receiver, triggering a digital output signal. The FC-51 is a low-cost, highly efficient infrared

. It consists of an IR transmitter and receiver pair, using a comparator circuit (LM393) to provide a simple digital output Ktechnics Systems Technical Specifications Operating Voltage: 3.0V to 6.0V DC Current Consumption: approximately at 3.3V and Detection Range: 2 cm to 30 cm (adjustable via onboard potentiometer) Art of Circuits Detection Angle: Output Signal: Digital (High = No Obstacle, Low = Obstacle Detected) Art of Circuits Dimensions: Approximately 43mm x 16mm x 7mm Радіокомпоненти Pinout & Hardware Features

While highly reliable, the FC-51 does have limitations that you should consider during system design: If the light hits a light-colored or reflective

A multi-turn potentiometer (blue trim pot) is used to increase (clockwise) or decrease (counter-clockwise) the sensitivity and detection distance. Operational Notes

Understanding the hardware physical layout helps in tuning and troubleshooting the device:

Here's an example code for Arduino: